bigger pistons moving slower(lower rpm)... boom.... boom.... vs boom boom boom... less violent feel. my dyna vibes just like my sporty, just slower and less violent. the BT thump is great.. but, BTs still vibrate. the softails and touring bikes have more dampening. the M8 is way smoother... my mind was blown by how smooth the new 107 is.

 

Radials vibrate a lot, but that big prop in front dampens a lot of it - flywheel effect, and more mass to absorb the vibration. A Sportster engine doesn't have a lot of rotating weight; it'll rev up fast, but really transmit the vibration to anything it's attached to, and the rubber mounts only absorb some of it. Japanese motors are smooth because many of them have counterbalancers - that really takes out the vibration when done right. It probably wouldn't be hard for Harley to make a real smooth counterbalanced motor for the sportster. Since they've made them a lot quieter when obviously the majority of owners want more noise, it might not be a stretch to think they'll smooth it out someday.

 

http://www.cycleworld.com/2016/02/01...sound-insights

 

So what's your preference on the vibration difference between the 03-Earlier SOLID "EVO" vs. 04-later Rubber "EVO"?

Does... "I'll admit the rubber mounting is a big improvement..." mean 04-later Rubber "EVO"?

I posted a POLL here:
POLL: ____ Vibration Preference? ____ 03-Earlier SOLID "EVO" vs. 04-later Rubber "EVO"

 

Energy applied through torque, friction of rubber to ground, ground pushing back against the torque force. Newton's Third Law of motion.

http://www.school-for-champions.com/...m#.V8RxYygrLIU

John

 

velocity

 

One thing I've noticed as I've tried a few different sets of slip-ons on my '07 is that the bike was a heck of a lot smoother with stock pipes and even Screamin' Eagle 80db pipes. With the Cycle Shack 105db pipes I have, it vibrates a lot, hand-tingling and all.

 

Radial engines all have odd numbers of cylinders in each bank....

 

you are so fired.